#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
    int num;
    while (scanf("%d", &num) != EOF)
    {
        for (int i = 0; i < num; i++)
        {
            for (int j = 0; j < num; j++)
            {
                if (i == 0 || j == 0 || i == num - 1 || j == num - 1)
                {
                    printf("* ");
                }
                else
                {
                    printf("  ");
                }
            }
            printf("\n");
        }

    }
    return 0;
}